57161231 has 2 divisors, whose sum is σ = 57161232. Its totient is φ = 57161230.

The previous prime is 57161207. The next prime is 57161239. The reversal of 57161231 is 13216175.

57161231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57161231 is a prime.

It is a super-2 number, since 2×57161231² = 6534812658870722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 57161231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57161239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28580615 + 28580616.

It is an arithmetic number, because the mean of its divisors is an integer number (28580616).

Almost surely, 2^57161231 is an apocalyptic number.

57161231 is a deficient number, since it is larger than the sum of its proper divisors (1).

57161231 is an equidigital number, since it uses as much as digits as its factorization.

57161231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 26.

The square root of 57161231 is about 7560.5046789219. The cubic root of 57161231 is about 385.2126356739.

The spelling of 57161231 in words is "fifty-seven million, one hundred sixty-one thousand, two hundred thirty-one".